INDUSTRY 4.0 u ANALOG DEVICES


10Mbps can be reached. This makes it possible to transmit not only a process value but also additional device parameters such as configuration and parameterisation information. In the future, possible software updates for the


increasingly complex sensors, as well as fault and network diagnostics such as short circuits on the line to the sensor, will be performed relatively quickly via the data line. Configuration is also easier because gateways and converters are no longer required with 10BASE-T1L. Through the elimination of the gateways, the costs and the complexity of these old installations are greatly reduced, and the data islands created by them are swept away. In addition, higher powers can be transmitted


over the data line. For example, 500mW in intrinsically safe areas (hazardous areas) and even up to 60W in non-intrinsically safe areas can be transmitted.


Ethernet standards such as PROFINET, EtherNet/


IP, HART-IP, OPC UA, or Modbus-TCP, and IoT protocols such as MQTT, can enable the easy and powerful connection of field devices to a cloud.


DOES 10BASE-T1L ALSO WORK WITH SWITCH MODULES? As with standard Ethernet, with 10BASE-T1L there are bridges that enable coupling of various network segments and devices. Different network topologies can be realised and used to supply power to the connected devices. In process automation, switches


Table 2. Overview of the different communication technologies in process automation 4mA to 20mA with HART 1.2kbps


Fieldbus Data Bandwidth


Connection to Higher Level Ethernet Networks


Power Offering for Instrument Know-How/Expertise Complex gateways <40mW


Know-How/Expertise shrink


24V 31.25kbps Complex gateways Limited


Know-How/Expertise shrink


Table 3. Overview of power transmission levels at different cable lengths (Type 18 AWG) 55V


1000m 400m 150m


7.7W 20W 52W


are often connected to controllers, HMIs, and the cloud. Switches allow media redundancy in the form of ring topologies for increased availability. In process automation, the connections to the


devices, sensors, and actuators are also called spurs, whereas connections between the switches and running up to the control system fall under the name trunk. Further possibilities arise from the constantly


increasing integration density of devices. For example, a 10BASE-T1L switch can be integrated into a sensor connected directly to additional


26 June 2023 Irish Manufacturing


1.23W 3.2W 8.3W


sensors that can also be supplied by it. Figure 2 shows an exemplary interconnection of different switches.


CAN I ALSO IMPLEMENT THE POWER SUPPLY TO THE DEVICES VIA THE “TWO WIRES”? The 10BASE-T1L standard not only offers communication of data from sensors and actuators, but also provides the possibility of supplying them with power via the signal lines. Concretely, 10BASE-T1L can deliver up to 60W of power in


10BASE-T1L 10Mbps


Seamless connectivity without gateways


Intrinsically safe: 500mW; non-intrinsically safe: up to 60W (depending on cable)


University graduates are very familiar with Ethernet


non-intrinsically safe areas. In explosion-protected (intrinsically safe) areas,


the power is limited to 500mW; in this case, the signal amplitude is also reduced from that of standard applications from 2.4V to 1V to comply with the strict requirements for maximum energy applicable there. However, as a result, only reduced transmission distances are possible in intrinsically safe areas. Table 3 provides an overview of the possible


power transmission levels for the various line lengths and areas for a Type 18 AWG cable.


CONCLUSION 10BASE-T1L provides a relatively robust communication standard for process automation that offers numerous advantages over conventional 4mA to 20mA applications, including the possibility of reusing the existing infrastructure.


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An example of a switch interconnection diagram Communication with a 10BASE- T1L-capable device takes place via the host processor. It usually requires an integrated MAC function, a passive media converter, or a switch with 10BASE-T1L ports]


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